Overview
The 74HC238DB,112 is a 3-to-8 line decoder/demultiplexer produced by Nexperia USA Inc. This device decodes three binary weighted address inputs (A0, A1, and A2) to eight mutually exclusive outputs (Y0 to Y7). It features three enable inputs (E1, E2, and E3), allowing for flexible control over the output states. The 74HC238DB can also be used as an eight-output demultiplexer by utilizing one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | 74HC238DB |
| Package Name | SSOP16 (SOT338-1) |
| VCC (V) | 2.0 to 6.0 |
| Logic Switching Levels | CMOS |
| Output Drive Capability (mA) | ± 5.2 |
| tpd (ns) | 14 |
| Power Dissipation (mW) | 500 (1/2 W) |
| Tamb (°C) | -40 to +125 |
| ESD Protection (HBM) | ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V |
| ESD Protection (CDM) | ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V |
Key Features
- Wide supply voltage range from 2.0 to 6.0 V
- CMOS low power dissipation
- High noise immunity
- Demultiplexing capability
- Multiple input enable for easy expansion
- Ideal for memory chip select decoding
- Active HIGH mutually exclusive outputs
- Complies with JEDEC standards (JESD8C and JESD7A)
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
- Multiple package options
Applications
The 74HC238DB is versatile and can be used in various applications, including:
- Memory chip select decoding
- Demultiplexing in digital systems
- Expansion to larger decoder systems (e.g., 1-of-32 lines with four '238 ICs and one inverter)
- Industrial and automotive electronics where high noise immunity and low power consumption are critical
- Consumer and mobile devices requiring efficient and reliable logic functions
Q & A
- What is the primary function of the 74HC238DB?
The primary function of the 74HC238DB is to decode three binary weighted address inputs to eight mutually exclusive outputs, and it can also be used as an eight-output demultiplexer.
- What is the voltage range for the 74HC238DB?
The voltage range for the 74HC238DB is from 2.0 to 6.0 V.
- What are the logic switching levels for the 74HC238DB?
The logic switching levels for the 74HC238DB are CMOS.
- What is the output drive capability of the 74HC238DB?
The output drive capability of the 74HC238DB is ± 5.2 mA.
- What is the typical propagation delay (tpd) for the 74HC238DB?
The typical propagation delay (tpd) for the 74HC238DB is 14 ns.
- What are the ESD protection levels for the 74HC238DB?
The 74HC238DB has ESD protection exceeding 2000 V for HBM and 1000 V for CDM.
- What are the operating temperature ranges for the 74HC238DB?
The operating temperature ranges for the 74HC238DB are from -40 °C to +125 °C.
- Can the 74HC238DB be used for demultiplexing?
Yes, the 74HC238DB can be used as an eight-output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.
- What are some common applications for the 74HC238DB?
Common applications include memory chip select decoding, demultiplexing in digital systems, and use in industrial and automotive electronics.
- Is the 74HC238DB compliant with JEDEC standards?
Yes, the 74HC238DB complies with JEDEC standards JESD8C and JESD7A.
